Carbon dioxide was adsorbed onto mesoporous adsorbent of ethylene diamine immobilized CP-MCM41 (EDA-CP-MS41), which was synthesized by chloropropyl functionalized MCM-41 (CP-MS41) with ethylene diamine, in a laboratory-scale packed-bed. The adsorber was operated batchwise with the charge of adsorbent in the range of 1-3g to obtain the breakthrough curves of CO2. Experiments were carried out at different adsorption temperatures (30-50 degrees C) and flow rates of nitrogen (15-60cm3/min) to investigate the effects of these experimental variables on the breakthrough curves. The deactivation model was tested for these curves by combining the adsorption of CO2 and the deactivation of adsorbent particles. The observed values of the adsorption rate constant and the deactivation rate constant were evaluated through analysis of the experimental breakthrough data using a nonlinear least squares technique. The experimental breakthrough data were fitted very well to the deactivation model than the adsorption isotherm models in the literature.